L1-L3 Chemistry 1

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Across
  1. 1. Everything in the universe is made up of this.
  2. 3. Distinct number of protons that defines an element.
  3. 5. Relies on an electric tip to resolve surface structures on the atomic scale.
  4. 6. State where positive charges equal negative charges.
  5. 8. Unique letter code representing an element on the table.
  6. 9. Positively charged subatomic particle.
  7. 11. Organises all known elements based on properties.
  8. 13. Central core zone of an atom.
  9. 14. Basic building block of all matter.
  10. 15. Atomic variant with identical protons but variable neutrons.
Down
  1. 2. Pure substance containing only one type of atom.
  2. 4. Calculated by adding protons and neutrons together.
  3. 7. Particle that has mass but registers zero electrical charge.
  4. 10. Central dense region holding protons and neutrons.
  5. 12. Negatively charged subatomic particle.